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	Effect of temperature on graphite oxidation behavior
	Luo Xiaoweia ; Jean-Charles, R. ; Yu Suyuana
	2010-05-10 ; 2010-05-10
关键词	Practical Experimental/ catalysis graphite moderators oxidation tensile strength thermal analysis thermal conductivity/ temperature dependence oxidation behavior graphite IG-11 HTR-10 thermo-gravimetric analysis dry air flow rate chemical reaction activation energy oxidation kinetics in-pore diffusion CO production impurity catalyse graphite oxidation thermal conductivity tensile strength 400 to 1200 C/ A8160 Corrosion, oxidation, etching, and other surface treatments A2842P Fission reactor moderators A8265J Heterogeneous catalysis at surfaces and other surface reactions A6670 Nonelectronic thermal conduction and heat-pulse propagation in nonmetallic solids A6220 Mechanical properties of solids (related to microscopic structure) A8140 Treatment of materials and its effects on microstructures and properties A2850I Gas cooled reactors/ temperature 6.73E+02 to 1.47E+03 K
中文摘要	The temperature dependence of oxidation behavior for the graphite IG-11, used in the HTR-10, was investigated by thermo-gravimetric analysis in the temperature range of 400-1200 degrees C. The oxidant was dry air (water content <2 ppm) with a flow rate of 20 ml/min. The oxidation time was 4 h. The oxidation results exhibited three regimes: in the 400-600 DC range, the activation energy was 158.56 kJ/mol and oxidation was controlled by chemical reaction; in the 600-800 degrees C range, the activation energy was 72.01 kJ/mol and oxidation kinetics were controlled by in-pore diffusion; when the temperature was over 800 degrees C, the activation energy was very low and oxidation was controlled by the boundary layer. Due to CO production, the oxidation rate increased at high temperatures. The effect of burn-off on activation energy was also investigated. In the 600-800 degrees C range, the activation energy decreased with burn-off. Results of low temperature tests were very dispersible because the oxidation behavior at low temperatures is sensitive to inhomogeneous distribution of any impurity, and some impurities can catalyse graphite oxidation.
语种	英语 ; 英语
出版者	Elsevier ; Netherlands
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/23089]
专题	清华大学
推荐引用方式 GB/T 7714	Luo Xiaoweia,Jean-Charles, R.,Yu Suyuana. Effect of temperature on graphite oxidation behavior[J],2010, 2010.
APA	Luo Xiaoweia,Jean-Charles, R.,&Yu Suyuana.(2010).Effect of temperature on graphite oxidation behavior..
MLA	Luo Xiaoweia,et al."Effect of temperature on graphite oxidation behavior".(2010).

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